JPH0581995A - Circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a circuit breaker that can be shared by both an earth leakage circuit breaker and a circuit breaker, and that can be shared and can improve assembly workability. [Constitution] Conductor 6 for connecting between power supply terminal 5 and fixed contact 9
Penetrates the zero-phase current transformer, so that the circuit in which the movable contact 15, the overcurrent detecting means 12 and the load terminal 13 are unitized can be shared by the earth leakage breaker and the circuit breaker. Moreover, the assembly workability of the unitized circuit itself is improved. Further, when the conductors 61 to 63 are bent, the first insulating plate 23, the second insulating plate 25, and the spacer 24 serve as a fulcrum at the time of bending, and absorb the force generated during processing. Prevents external force from acting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in circuit breakers such as earth leakage circuit breakers and circuit breakers.

[0002]

2. Description of the Related Art For example, as a conventional technology of an earth leakage circuit breaker, there is a technology disclosed in Japanese Patent Laid-Open No. 2-135643. In the publication, in order to prevent damage to the insulating tube of the lead wire passing through the zero-phase current transformer when assembling the zero-phase current transformer and the leakage detection device below the overcurrent detection device, , The inter-electrode insulation base that also functions as the insulation between each pole of the overcurrent detection means and the stopper of the movable contact base is configured as a single component separate from the case of the earth leakage breaker. I am trying to attach it freely. In this case, the zero-phase current transformer is configured to pass through the connection line connected between the movable contact and the overcurrent detection means. In addition, the connecting wire that penetrates the zero-phase current transformer is made of a conductive thin plate.When assembled, after passing through the zero-phase current transformer, it is bent into a desired shape and then used for insulation between conductors of different polarity. It is covered with an insulating tape or an insulating tube.

[0003]

By the way, in the above-mentioned conventional earth leakage circuit breaker, the zero-phase current transformer is constructed so as to pass through the connection line between the movable contact and the overcurrent detection means. Therefore, if you try to use this unit for a circuit breaker that does not need to incorporate a zero-phase current transformer,
There is a problem that cannot be shared. In order to solve this problem, it is easy to simply remove both the zero-phase current transformer and the earth leakage detecting means. However, if this is done, the space for both will be an empty space, which is wasteful. In addition to the above, there is a problem that it hinders the miniaturization of the circuit breaker itself. Further, if the connecting wire between the movable contact and the overcurrent detecting means is formed of a conductive thin plate, when bending is performed after penetrating the zero-phase current transformer, the force at the time of processing is applied to the built-in parts through the case. Therefore, the characteristics as an earth leakage breaker may change,
Moreover, when covered with insulating tape or insulating tube,
Since it takes a lot of work, there is a problem that workability is not good. Further, the connection line between the movable contact and the overcurrent detection means extends to the load terminal to form the main circuit conductor, and this main circuit conductor is connected to the multipole main circuit conductor after penetrating the zero-phase current transformer. Since they are handled collectively, there is a problem that the workability of incorporating them in the case is poor.

In view of the above problems of the prior art, an object of the present invention is to provide a circuit breaker which can be used both as an earth leakage circuit breaker and a circuit breaker, and another object is to provide both. An object of the present invention is to provide a circuit breaker that can be shared by circuit breakers and that can improve assembly workability.

[0005]

In the present invention, the conductor connecting the power supply terminal and the fixed contact penetrates the zero-phase current transformer. Further, in the present invention, a conductor formed of a bendable thin plate, which penetrates the zero-phase current transformer and connects the power supply terminal and the fixed contact, and is arranged on one side surface of the zero-phase current transformer, And a first insulating plate having a peripheral wall adapted to the inner periphery of the zero-phase current transformer, a second insulating plate arranged on the other side surface of the zero-phase current transformer, and a peripheral wall of the first insulating plate. And a spacer having a groove in which the conductor can be inserted. Then, the conductor is inserted from the first insulating plate side into the groove of the spacer and bent along the second insulating plate side.

[0006]

In the present invention, as described above, since the conductor connecting the power supply terminal and the fixed contact penetrates the zero-phase current transformer, the movable contact, the overcurrent detecting means, and the load terminal can be unitized. Therefore, the unit can be shared by both the earth leakage breaker and the circuit breaker. In the present invention, since the conductor, the first insulating plate, the second insulating plate, and the spacer are provided, even if a force is generated when the conductor is bent, the force is the same as that of the first and second insulating plates. Since it is absorbed by the spacer,
It is possible to reliably prevent the external force from acting on other peripheral parts as well as the zero-phase current transformer. Therefore, even if the conductor is bent,
There is no risk of changing the characteristics of the zero-phase current transformer and other peripheral components.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4 show a first embodiment of a circuit breaker according to the present invention. The circuit breaker of the embodiment is applied to three phases, and as shown in FIG. 1, the contacts, the overcurrent detection means 12, the load terminal 13, the zero phase are provided in the space formed by the case 1 and the cover 2. The current transformer 6, the earth leakage detecting means 16 and the like are built in to constitute an earth leakage breaker. The contacts are composed of a fixed contact 9 provided on the fixed contact base 8 and a movable contact 15 provided at one end of the movable contact base 10. The fixed contact base 8 is connected to a power supply terminal 5 provided outside the case 1 via a conductor 6 and fixed to the case 1. On the other hand, the movable contact base 10 is rotatably supported in the case 1, and the overcurrent detection means 1 is connected to the other end through a conductor 11.
Connected to 2. One end of a load terminal 13 is connected to the overcurrent detecting means 12, and the other end of the load terminal 13 is provided so as to project to the outside of the case 1.

When the fixed contact 9 and the movable contact 15 are closed to close the contacts, if an overcurrent flows in the circuit, the overcurrent detection means 12 detects it and attracts the movable core 12 '. The attracted movable core 12 'actuates a common trip shaft 14 provided in common for each pole, and a trip mechanism 18 (not shown in detail) trips to move the movable contact point 10 through the common shaft 15. In FIG. 1, the contacts are rotated clockwise so that the contacts are opened. These contacts, overcurrent detection means 12, load terminal 13
Are arranged by the number of poles. On the other hand, a voltage trip device 17 is arranged near the trip mechanism, and a leakage detecting means 16 is arranged below the overcurrent detecting means 12. Then, when the ground fault current flowing through the circuit reaches a predetermined value, the zero-phase current transformer 7 detects it, and the detection signal is amplified by the leakage detection means 16 to drive the voltage trip device 17, The common trip shaft 14 is actuated in the same manner as when the voltage trip device 17 detects an overcurrent, and the trip mechanism 18 trips to open the movable contact 15. When the tripping mechanism 18 trips, the operating handle 4 moves in the direction of the arrow shown in FIG. 1, and the operating handle 4 enables the opening and closing of the circuit breaker and the return operation after the tripping of the tripping mechanism from the outside. Therefore, it is provided on the upper portion of the cover 2. Then, the conductor 6 between the power supply terminal 5 and the fixed contact a penetrates the zero-phase current transformer 7. Therefore, the zero-phase current transformer 7 is located below the fixed contact base 8 in the case 1 and penetrates the conductor 6 of each pole. In addition, the conductor 6 is insulated from the outside by mounting an insulating tube in this example. This circuit configuration is shown in FIG. In FIG. 3, 5a to 5c are power terminals, 6a to 6c are conductors, 15a to 15c are movable contacts, 1
Reference numerals 2a to 12c denote overcurrent detection means, and 13a to 13c denote load terminals, which correspond to FIGS. 1 and 2, respectively.
Here, further description is omitted.

As described above, the circuit breaker of the embodiment is constructed so that the conductor 6 between the power supply terminal 5 and the fixed contact 9 penetrates the zero-phase current transformer 7, so that the movable contact 15, the conducting wire 11, the overcurrent. When the detecting means 12 and the load terminal 13 are unitized, the unitized circuit can be shared by both the earth leakage breaker and the circuit breaker. That is, as shown in FIG. 4, unless the power supply terminal 5 and the fixed contact 9 are simply connected by the conductor 6 and the zero-phase current transformer, the earth leakage detection means, and the voltage trip device are not used, the movable contact 15 A circuit in which the overcurrent detecting means 12 and the load terminal 13 are unitized can be used as a circuit breaker. Moreover, when the conductor 6 penetrates the zero-phase current transformer 7, it is not necessary to incorporate the zero-phase current transformer 7 between the movable contact 15 and the load terminal 13, so that the unitized circuit itself has good workability in assembly. In addition, the space required for the zero-phase current transformer can be omitted as compared with the prior art.

5 and 6 show a second embodiment of the circuit breaker according to the present invention. In this case, each of the three-phase conductors 61 to 63 penetrating the zero-phase current transformer 7 is formed by processing a plate material. That is, the conductors 61 to 6
3 includes power supply terminals 5a to 5c and fixed contact bases 8a to 8c corresponding to the respective poles, which are formed in advance by being integrally or bonded. However, the conductor 61
When used for three-phase, each of Nos. 63 to 63 has a different position of penetrating the zero-phase current transformer 7 from each other, and it is necessary to bend the penetrating parts according to the positions to have desired shapes. It goes without saying that it is necessary to take an insulation distance between them. An insulating plate 19 is provided above the conductors 61 to 63.

According to this embodiment, since the conductors 61 to 63 not only function as conductors but also function as the power supply terminal portion 5 and the fixed contact base 8, the number of parts can be reduced accordingly.

7 and 8 show another embodiment of the circuit breaker according to the present invention. In this case, the conductor penetrating the zero-phase current transformer 7 is composed of a bendable thin plate. Specifically, the conductors are formed of first to third conductors 61 to 63 corresponding to three phases, and these first to third conductors 61 to 6 are used.
As shown in FIG. 7, bent portions 61a, 62a, 63a forming power supply terminals are respectively formed at one end of 3, and the intermediate positions thereof are horizontally processed so as to face the zero-phase current transformer 7. , And as shown in FIG. 8, the other end side 61b,
62b and 63b are bent downward at right angles so that they can penetrate the zero-phase current transformer 7. Each of these conductors 61 to
At the time of penetrating 63, the first insulating plate 23 and the second insulating plate 25 are previously installed on the upper surface side and the lower surface side of the zero-phase current transformer 7, and the spacers 24 are respectively installed on the first insulating plate 23. There is. The first insulating plate 23 is for absorbing the force generated when the conductors penetrating the zero-phase current transformer 7 are bent, and is a flat plate extending between the conductors 61 to 63. At the same time, the peripheral wall 23a is suitable for the inner circumference of the zero-phase current transformer 7 and has a size slightly larger than the thickness of the zero-phase current transformer 7.
have. The second insulating plate 25 has a hole 25a through which the spacer 24 can be inserted. Similar to the first insulating plate 23, the spacer 24 absorbs the force generated when the conductors 61 to 63 are bent and also insulates the conductors from each other. That is, as shown in FIG. 8, the spacer 24 has a size that fits into the peripheral wall 23a of the first insulating plate 23, and has the other end side 61b of the first conductor 61 and the other end side of the second conductor 62 on the outer periphery thereof. 62b, the 1st line groove 24a which can insert the other end side 63b of the 3rd conductor 63 independently, respectively, the 2nd line groove 24b, the 3rd line groove 2
4c is formed. Among these, the 1st groove | channel 24a and the 3rd groove | channel 24c are in an opposing position. Then, after the zero-phase current transformer 7, the first and second insulating plates 23 and 25 and the spacer 24 are assembled, the first to third groove 24a of the spacer 24 is installed.
To 24c, the other end side 61b of the first to third conductors 61 to 63,
62b, 63b are respectively inserted, and the other end sides 61b, 62
B and 63b are respectively bent along the second insulating plate 25 in the arrow direction as shown in FIG. The other end side bent at this time is shown by a broken line and is represented by reference numerals 61b ', 62b', 63b '. Therefore, in this embodiment, the conductors 61 to 63 penetrating the zero-phase current transformer 6, the first insulating plate 23 arranged on the upper surface side of the zero-phase current transformer 7, and the zero-phase current transformer. Second insulating plate 25 and the first insulating plate 23 arranged on the lower surface side of 7.
And a spacer 24 fitted to the peripheral wall 23a of each of them. Further, although not shown in detail in FIG. 7, each of the conductors 61 to 63 has a power supply terminal 5a at one end and a fixed contact stand (not shown) at the other end. Further, as shown in FIG. 7, a space 26 corresponding to the thickness of the zero-phase current transformer 7 is formed between the first insulating plate 23 and the second insulating plate 25. The leakage detection circuit 16 is housed. According to this embodiment, when the other ends 61b, 62b, 63b of the first to third conductors 61 are bent, the first and second insulating plates 23, 25 incorporated in the zero-phase current transformer 7 are formed. Since the spacer 24 serves as a fulcrum during bending and absorbs the force generated during bending,
It is possible to prevent external force from acting on the zero-phase current transformer 7.
Therefore, even if each of the first to third conductors 61 to 63 is bent, the characteristics of the zero-phase current transformer 7 and other peripheral components are not likely to change. In addition, the spacer 24 is used for each conductor 6
In addition to absorbing the force of bending 1 to 63 at the time of bending, since it is possible to insulate the conductors 61 to 63 of each pole from each other by the insulating material, the insulating function for the zero-phase current transformer 7 can be fulfilled. Since it is not necessary to attach an insulating tube or insulating tape to each conductor, the workability of assembly can be improved. Further, since the leakage detecting means 16 is housed in the space portion 26 formed between the first and second insulating plates 23 and 25, not only can the space be effectively utilized, but also the leakage detecting means 16 and zero phase can be used. When both the current transformer 7 and the current transformer 7 are arranged on the power supply terminal side, unitization from the movable contact to the load terminal is more easily achieved, and the workability of manufacturing and assembling the unit is further improved. Since each conductor 61 serves both as a power source terminal and a fixed contact stand, the same effect as the second embodiment can be obtained.

[0013]

As described above, according to claim 1 of the present invention, since the conductor connecting between the power supply terminal and the fixed contact is configured to pass through the zero-phase current transformer, the movable contact and the conducting wire. ，
The overcurrent detection means and the load terminal can be unitized, and the unitized circuit can be shared by both the earth leakage breaker and the circuit breaker, so that there is an effect that the sharing can be surely performed. According to the second aspect, since the conductor serves as both the power supply terminal portion and the fixed contact base portion, there is an effect that the number of parts can be reduced and maintenance management can be facilitated. According to claim 3, it has a conductor penetrating the zero-phase current transformer, first and second insulating plates, and a spacer, and the force generated when the conductor is bent is the first and second insulating plates and the spacer. Since it is configured to be absorbed by and, it is possible to prevent the external force from acting on not only the zero-phase current transformer but also other peripheral components, and as a result, there is an effect that the characteristic does not change. According to this, since the leakage detecting means is housed in the space between the first insulating plate and the second insulating plate, there is an effect that the space can be effectively utilized in addition to the effect of claim 3. According to claim 5, even if the conductor is composed of a plurality of poles, it is not necessary to attach an insulating tape, an insulating tube, or the like to these conductors, so that the assembling workability can be improved. In this case, the same effect as that of claim 2 is obtained.

[Brief description of drawings]

FIG. 1 is an overall side sectional view of a first embodiment of a circuit breaker according to the present invention applied to an earth leakage circuit breaker.

FIG. 2 is a plan view of the whole with a part broken away.

FIG. 3 is a circuit diagram of an earth leakage breaker.

FIG. 4 is a side sectional view of an entire circuit breaker to which the circuit breaker according to the present invention is applied.

FIG. 5 is a plan view of an essential part showing a second embodiment of the circuit breaker according to the present invention.

6 is a side sectional view of FIG.

FIG. 7 is a perspective view of a circuit breaker according to another embodiment of the present invention in a state where a conductor penetrates a zero-phase current transformer.

FIG. 8 is an explanatory cross-sectional view when the conductor similarly penetrates the zero-phase current transformer and is bent.

[Explanation of symbols]

5, 5a to 5c ... Power supply terminals, 6, 6a to 6c, 61 to 6
3 ... conductor, 9 ... fixed contact, 15, 15a-15c ... movable contact, 11 ... conducting wire, 12, 12a-12c ... overcurrent detection means, 13, 13a-13c ... load terminal, 7 ... zero-phase current transformer, 16 ... Leakage detecting means, 17 ... Voltage trip device, 23
... first insulating plate, 23a ... peripheral wall, 24 ... spacer, 24a
-24c ... 1st-3rd groove | channel, 25 ... 2nd insulating plate, 26 ...
Space section.

Claims (6)

[Claims] 1. A power supply terminal, a contact consisting of a fixed contact and a movable contact, and an overcurrent detection means connected to the movable contact,
In a zero-phase current transformer and a circuit breaker having the zero current transformer,
A circuit breaker, wherein a conductor connecting between the power supply terminal and the fixed contact passes through the zero-phase current transformer. 2. The circuit breaker, wherein the conductor serves both as a power supply terminal and a fixed terminal block for fixed contacts. 3. A power supply terminal, a contact consisting of a fixed contact and a movable contact, and an overcurrent detecting means connected to the movable contact,
A zero-phase current transformer, and a circuit breaker having the zero-phase current transformer, a conductor formed of a bendable thin plate and penetrating the zero-phase current transformer and connecting a power supply terminal and a fixed contact, A first insulating plate, which is arranged on one side surface of the zero-phase current transformer and has a peripheral wall adapted to the inner circumference of the zero-phase current transformer, and arranged on the other side surface of the zero-phase current transformer. A second insulating plate and a spacer having a groove that fits on the peripheral wall of the first insulating plate and allows the conductor to be inserted therethrough, and the conductor is inserted from the first insulating plate side into the groove of the spacer. A circuit breaker characterized by being bent along the insulating plate side. 4. A power supply terminal, a contact composed of a fixed contact and a movable contact, and an overcurrent detection means connected to the movable contact,
In a circuit breaker having a zero-phase current transformer, the zero-phase current transformer, and an earth leakage detection means connected to the zero-phase current transformer, the zero-phase current transformer is formed of a bendable thin plate. A conductor that penetrates through and connects the power supply terminal to the fixed contact; and a first insulating plate that is disposed on one side surface of the zero-phase current transformer and that has a peripheral wall that fits the inner circumference of the zero-phase current transformer. , A second insulating plate arranged on the other side surface of the zero-phase current transformer, and fitted to the peripheral wall of the first insulating plate,
And a spacer having a groove in which the conductor can be inserted,
The conductor is inserted from the side of the first insulating plate into the groove of the spacer and bent along the side of the second insulating plate, and the earth leakage detecting means is housed in the space formed by the first insulating plate and the second insulating plate. A circuit breaker characterized by: 5. A plurality of said grooves are formed so that conductors for each phase can be independently inserted, and a spacer having each groove is formed of an insulating material for insulating the conductors for each phase from each other. The circuit breaker according to claim 3 or 4, wherein 6. The circuit breaker according to claim 3, wherein the conductor serves as both a power supply terminal portion and a fixed terminal block portion for fixed contacts.